If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

FUNCTION PROBLEMS

The engine will NOT go to high
speed when either a welding load
or an auxiliary load is connected to
the Classic II. The machine has
normal output and engine speed
when the Idler switch is in the “High
position.

1. Check the welding cables and

auxiliary load leads for loose or
faulty connections.

2. Check for mechanical restric-

tions or missing parts in the idler
and throttle linkage (Springs,
etc.).

1. The Idler PC board may be

faulty.

The engine will not shut down.

1. Make sure the ignition switch is

turned off and operating correct-
ly.

2. On older machines (below serial

number U1940718502), make
sure Diode Kit S-21548 has
been installed.

1. Check the fuel solenoid for

proper operation. When 12VDC
is applied to the solenoid at
leads #58 (+) to #60(-), the fuel
solenoid should be open. When
the 12VDC is removed the sole-
noid should close, stopping fuel
flow to the engine.

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